一位著名的美国学者曾指出:“人类的发展可分为三个阶段。第一个阶段是人类通过制造工具,扩展体力活动的能力,第二阶段通过提高判断能力,寻求更清晰和更广泛的理解与判断事物的标准,而人类近年来致力的增强获得输入信息的能力,扩大感觉范围或增添新的感官,使我们的大脑能接受更 A famous American scholar once pointed out: "Human development can be divided into three phases: the first phase is the ability of mankind to expand physical activity through the manufacture of tools, the second phase is to seek clearer and more extensive Understanding and judging the standard of things, and in recent years, mankind has been devoted to enhancing the ability to input information, expanding the range of feeling or adding new senses so that our brains can accept more